<ion-header>
  <ion-navbar>
    <ion-title>
      Contact
    </ion-title>
  </ion-navbar>
</ion-header>

<ion-content>
  <button ion-button full (click)=scan() >barcode扫描</button>
  <button ion-button full (click)=qrscan()>QR扫描</button>
  
</ion-content>
